Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1997-11-24
2000-06-13
Angebranndt, Martin
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430313, 4302801, 4302811, 1562735, 1562755, 1562739, H05K 346
Patent
active
060748036
ABSTRACT:
A process for manufacturing a multi-layer circuit board comprises applying a layer of a photo-resist to the conducting surface of an inner-layer and fixing the resin composition in a pre-selected pattern for example by exposing to UV radiation which results in polymerization in the exposed areas. After removing the non-fixed areas by developing in an aqueous developing solution and etching in an etching solution, the fixed areas of resin composition remain in place on the inner-layer and are directly adhered to the neighboring insulating layer in an adhesion step.
The preferred resin compositions according to the invention comprise a first photo-polymerizable resin component having an acid number from 15 to 75, a second epoxy resin component having unreacted epoxy groups, and a photoinitator, the ratio or first to second resin components being at least 1:1.
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Hetterich Wolfgang
McGrath Peter Thomas
Alpha Metals Limited
Angebranndt Martin
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